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Subject2.4.21pre4-ac2 IDE status on PDC20268
I gave 2.4.21-pre4-ac2 a spin.

IDE seems to be shaping up, the only problem I ran into with
it is about the darn PDC20268 -- again. It seems to work nicely
but misdetects the max transfer rate of the only drive on the
secondary channel and then won't allow me to set UDMA > 2 on it
(I get no error msg but there's no change).

The ideX=ata66 switch doesn't seem to do anything any more.
(On 2.4.{19,20} if I omit "ide2=ata66 ide3=ata66", I get
the UDMA <= 2 restriction on *both* channels of the PDC.)

hdparm -Iv of the affected drive (from 2.4.20):
/dev/hdg:
multcount = 0 (off)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 1869/255/63, sectors = 30033360, start = 0

ATA device, with non-removable media
Model Number: IBM-DJNA-351520
Serial Number: G80GLT4F735
Firmware Revision: J56OA30K
Standards:
Used: ATA/ATAPI-4 T13 1153D revision 17
Supported: 4 3 2 1 & some of 5
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 30033360
device size with M = 1024*1024: 14664 MBytes
device size with M = 1000*1000: 15377 MBytes (15 GB)
Capabilities:
LBA, IORDY(can be disabled)
Buffer size: 430.0kB bytes avail on r/w long: 34 Queue depth: 32
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 16 Current = 0
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=240ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* NOP cmd
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
Release interrupt
* Look-ahead
* Write cache
* Power Management feature set
Security Mode feature set
* SMART feature set
Address Offset Reserved Area Boot
* READ/WRITE DMA QUEUED
* DOWNLOAD MICROCODE cmd
Security:
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
26min for SECURITY ERASE UNIT.

Compare:

Linux version 2.4.21-pre4-ac2 (kala@ns) (gcc version 2.95.3 20010315 (release)) #1 Wed Feb 5 06:50:14 CET 2003
...
Kernel command line: auto BOOT_IMAGE=l rw root=900
Uniform Multi-Platform E-IDE driver Revision: 7.00beta-2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX3: IDE controller at PCI slot 00:04.1
PCI: Enabling device 00:04.1 (0000 -> 0001)
PIIX3: chipset revision 0
PIIX3: not 100% native mode: will probe irqs later
PIIX3: neither IDE port enabled (BIOS)
PDC20268: IDE controller at PCI slot 00:06.0
PDC20268: chipset revision 2
PDC20268: not 100% native mode: will probe irqs later
ide2: BM-DMA at 0xf8b0-0xf8b7, BIOS settings: hde:pio, hdf:pio
ide3: BM-DMA at 0xf8b8-0xf8bf, BIOS settings: hdg:pio, hdh:pio
hde: WDC WD205BA, ATA DISK drive
blk: queue c02abf60, I/O limit 4095Mb (mask 0xffffffff)
hdg: IBM-DJNA-351520, ATA DISK drive
blk: queue c02ac3d0, I/O limit 4095Mb (mask 0xffffffff)
ide2 at 0xf898-0xf89f,0xf8aa on irq 9
ide3 at 0xf8a0-0xf8a7,0xf8ae on irq 9
hde: host protected area => 1
hde: 40088160 sectors (20525 MB) w/2048KiB Cache, CHS=39770/16/63, UDMA(66)
hdg: host protected area => 1
hdg: 30033360 sectors (15377 MB) w/430KiB Cache, CHS=29795/16/63, UDMA(33)

^^
vs.

Linux version 2.4.21-pre4-2420ide-1 (kala@ns) (gcc version 2.95.3 20010315 (release)) #1 Wed Jan 29 11:27:16 CET 2003
...
Kernel command line: auto BOOT_IMAGE=l rw root=900 ide2=ata66 ide3=ata66
ide_setup: ide2=ata66
ide_setup: ide3=ata66
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX3: IDE controller on PCI bus 00 dev 21
PCI: Enabling device 00:04.1 (0000 -> 0001)
PIIX3: chipset revision 0
PIIX3: not 100% native mode: will probe irqs later
PIIX3: neither IDE port enabled (BIOS)
PDC20268: IDE controller on PCI bus 00 dev 30
PDC20268: chipset revision 2
PDC20268: not 100% native mode: will probe irqs later
PDC20268: (U)DMA Burst Bit DISABLED Primary PCI Mode Secondary PCI Mode.
PDC20268: ATA-66/100 forced bit set (WARNING)!!
ide2: BM-DMA at 0xf8b0-0xf8b7, BIOS settings: hde:pio, hdf:pio
PDC20268: ATA-66/100 forced bit set (WARNING)!!
ide3: BM-DMA at 0xf8b8-0xf8bf, BIOS settings: hdg:pio, hdh:pio
hde: WDC WD205BA, ATA DISK drive
hdg: IBM-DJNA-351520, ATA DISK drive
ide2 at 0xf898-0xf89f,0xf8aa on irq 9
ide3 at 0xf8a0-0xf8a7,0xf8ae on irq 9
blk: queue c029d38c, I/O limit 4095Mb (mask 0xffffffff)
hde: 40088160 sectors (20525 MB) w/2048KiB Cache, CHS=39770/16/63, UDMA(66)
blk: queue c029d6f0, I/O limit 4095Mb (mask 0xffffffff)
hdg: 30033360 sectors (15377 MB) w/430KiB Cache, CHS=29795/16/63, UDMA(66)

T.
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